Hello everybody, my 14-days test is at the end. And I have come to conclusion, which I will put in the end so you have to read it whole. ?
My complaints about XS were fixed with iPhone 12 mini (smaller size, usable with one hand and weight with round design). iPhone 12 mini fits absolutely in my workflow and my products line. I still use my iPhone the same amount of time and haven't had problem with battery life in any of them (at least comparing Xs, 12 mini and regular 12 - of course the latter has the biggest usage, but for me those few percent didn't made a lot of impact).
Pros for 12
1) Readability. Everything in iOS seems just right with bigger display. From text to opening PDF files.
2) Battery life. Everyday I got approximately 10-20% more of my iPhone. I could be better in future when it will be possible to travel, but these days who cares? Still even if I need some more juice, I'm in my work, in car or at home. I don't know this will stand in long term, but Apple Care+ I could easily replace my battery at the end of 2 year spell. Recently I recorded a lot of videos in 4k 60fps and it was great using this bigger machine. But at the end of the end, it wouldn't much of a problem to use smaller one. Still it would certainly lasted shorter time.
Cons for 12
1) Size. Yes, we all know this. After almost 14 days I wasn't able to use it properly with one my hand. It feels slippery in my hand and despite that cut on my left hand (which is now without the bandage) I couldn't learn how to use it not to feel to drop it. Writing with both hands are fine, but being afraid about that phone when I'm taking out of my pocket is a real issue for me personally. My thumb hurts when I'm using it for a longer period in my bed laying on my side and side of the phone is on the bed. I never had that much ache in my hand before.
2) Grip. Because of that size I more often need to use that phone both hands. That's an issue for me - when I'm outside for a walk, paying in the shop (and typing the passcode - still not convinced about Apple Watch, but considering it now) or just quick message. All the time I needed that second hand, which for example is out of the question with groceries in my other hand.
3) Weight. Man, that size comes with bigger weight. I knew it, I was prepared for it and still didn't expect it that much. So many times it feels too strange to hold it in my hands. I don't know why, I can't explain it - it's a feeling. We often decide many things based on our feelings, so maybe it helped me to decide too.
Final
Well as you can see, trying regular 12 has some upsides and downsides. Every person is different, I don't watch much videos on my phone, don't do many socials and I don't a phone at a size of a tablet. I have only wish from Apple: keeping the mini in the lineup at least for a next two years. That means we could be happy for a longer period of time to use it. I was happy with him after a few months but I had some doubts. Now I don't have any and I was really happy, when I put my personal SIM to mini. Oh that was like a burden not to have a light and one-hand usable phone in my hand.
Tips for Apple
Despite I hate ultrawide I have been using it for those videos I mentioned above and it was great for inside shooting. But I think I would be fine with "normal" wide lens with ease. Still, I would love to see telephoto in future in mini and regular 13 (or other names?). If it will get more battery based on newer chip, thicker body or better technology, it just couldn't be a bad thing at all. It would be just a nice addition to a perfect phone I love these days.
Missing piece
Sadly admiting that even I never thought about that a lot - I do miss 3D Touch. I will remember XS maybe just because of this technology. I never thought that this could make such an impact for me, honestly.
Thank you for your comments and patience with me.